Have you installed Last Moon before?
If so, you may either want to:
1) Empty out your recycle bin
2) Go into your Control Panel, and then to the section called "Remove/Uninstall Programs" (Or something around those words, can't quite remember :/) And check through your list of installed programs to see if Last Moon is still installed on your computer. If it is, click on it and then on the bar above, click uninstall.
If you haven't installed Last Moon before, I dont know why your computer is doing that, I've never heard of an error/issue like this :L
Hope I helped! Good Luck~